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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/favicon_base/favicon_url_parser.h"
#include "base/strings/string_number_conversions.h"
#include "components/favicon_base/favicon_types.h"
#include "net/url_request/url_request.h"
#include "ui/base/webui/web_ui_util.h"
#include "ui/gfx/favicon_size.h"
namespace {
// Parameters which can be used in chrome://favicon path. See file
// "chrome/browser/ui/webui/favicon_source.h" for a description of
// what each does.
const char kIconURLParameter[] = "iconurl/";
const char kLargestParameter[] = "largest/";
const char kOriginParameter[] = "origin/";
const char kSizeParameter[] = "size/";
// Returns true if |search| is a substring of |path| which starts at
// |start_index|.
bool HasSubstringAt(const std::string& path,
size_t start_index,
const std::string& search) {
return path.compare(start_index, search.length(), search) == 0;
}
} // namespace
namespace chrome {
bool ParseFaviconPath(const std::string& path,
int icon_types,
ParsedFaviconPath* parsed) {
parsed->is_icon_url = false;
parsed->url = "";
parsed->size_in_dip = gfx::kFaviconSize;
parsed->device_scale_factor = 1.0f;
parsed->path_index = std::string::npos;
if (path.empty())
return false;
size_t parsed_index = 0;
if (HasSubstringAt(path, parsed_index, kLargestParameter)) {
parsed_index += strlen(kLargestParameter);
parsed->size_in_dip = 0;
} else if (HasSubstringAt(path, parsed_index, kSizeParameter)) {
parsed_index += strlen(kSizeParameter);
size_t slash = path.find("/", parsed_index);
if (slash == std::string::npos)
return false;
size_t scale_delimiter = path.find("@", parsed_index);
std::string size_str;
std::string scale_str;
if (scale_delimiter == std::string::npos) {
// Support the legacy size format of 'size/aa/' where 'aa' is the desired
// size in DIP for the sake of not regressing the extensions which use it.
size_str = path.substr(parsed_index, slash - parsed_index);
} else {
size_str = path.substr(parsed_index, scale_delimiter - parsed_index);
scale_str = path.substr(scale_delimiter + 1,
slash - scale_delimiter - 1);
}
if (!base::StringToInt(size_str, &parsed->size_in_dip))
return false;
if (parsed->size_in_dip != (gfx::kFaviconSize * 4) &&
parsed->size_in_dip != (gfx::kFaviconSize * 2)) {
// Only 64x64, 32x32 and 16x16 icons are supported.
parsed->size_in_dip = gfx::kFaviconSize;
}
if (!scale_str.empty())
webui::ParseScaleFactor(scale_str, &parsed->device_scale_factor);
// Return the default favicon (as opposed to a resized favicon) for
// favicon sizes which are not cached by the favicon service.
// Currently the favicon service caches:
// - favicons of sizes "gfx::kFaviconSize * scale factor" px of type FAVICON
// where scale factor is one of FaviconUtil::GetFaviconScales().
// - the largest TOUCH_ICON / TOUCH_PRECOMPOSED_ICON
if (parsed->size_in_dip != gfx::kFaviconSize &&
icon_types == favicon_base::FAVICON)
return false;
parsed_index = slash + 1;
}
if (HasSubstringAt(path, parsed_index, kIconURLParameter)) {
parsed_index += strlen(kIconURLParameter);
parsed->is_icon_url = true;
parsed->url = path.substr(parsed_index);
} else if (HasSubstringAt(path, parsed_index, kOriginParameter)) {
// URL requests prefixed with "origin/" are converted to a form with an
// empty path and a valid scheme. (e.g., example.com -->
// http://example.com/ or http://example.com/a --> http://example.com/)
parsed_index += strlen(kOriginParameter);
std::string possibly_invalid_url = path.substr(parsed_index);
// If the URL does not specify a scheme (e.g., example.com instead of
// http://example.com), add "http://" as a default.
if (!GURL(possibly_invalid_url).has_scheme())
possibly_invalid_url = "http://" + possibly_invalid_url;
// Strip the path beyond the top-level domain.
parsed->url = GURL(possibly_invalid_url).GetOrigin().spec();
} else {
parsed->url = path.substr(parsed_index);
}
// The parsed index needs to be returned in order to allow Instant Extended
// to translate favicon URLs using advanced parameters.
// Example:
// "chrome-search://favicon/size/16@2x/<renderer-id>/<most-visited-id>"
// would be translated to:
// "chrome-search://favicon/size/16@2x/<most-visited-item-with-given-id>".
parsed->path_index = parsed_index;
return true;
}
} // namespace chrome
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